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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Exhaust Mods

Exhaust Mods Performance Exhaust Modifications

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  #21  
Old 01-17-2013, 04:01 PM
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NoId NoId is offline
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2003 Chevy TrailBlazer LS
Medium Sage Green Metallic 4.2L I6 4X4
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I just went out to my truck and looked. The brake booster line is definatly easier to access and a better location to use. Same concept except from that location is 100% better.
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  #22  
Old 01-17-2013, 04:03 PM
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arl120384 arl120384 is offline
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2005 Chevy TrailBlazer LS
Medium Red Metallic 4.2L I6 4X4
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Ok thanks. Ill try to find that thread.
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  #23  
Old 01-22-2013, 11:33 PM
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arl120384 arl120384 is offline
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2005 Chevy TrailBlazer LS
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I found my leak. Looks to be leaking from the farthest 2 exhaust flanges. The 5th is missing one bolt altogether, and the 6th has a good gap between the manifold and the block. This isn't a fix I really want to try to tackle, and I don't think it's a wise idea to try and tighten it either. Guess ill live with the noise until it gets really bad. At least it's not a crack...yet. Would anyone recommend an exhaust weld paste to bead around the gasket?
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  #24  
Old 08-15-2013, 06:02 PM
TDHeller TDHeller is offline
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2002 Chevy TrailBlazer LTZ
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Exhaust Paste??!!

As a retired GM Engineer/Technician, I would definitely NOT Recommend ANY type of PASTE or GOO to repair this problem.
It will NOT last and could very likely damage the O2 sensors and or the Catalyst.
My advice ... JUST DON'T DO IT. Spend the time or money to have it fixed properly or just trade it in.
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  #25  
Old 01-13-2014, 03:59 PM
gbernich gbernich is offline
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2003 Trailblazer LT EXT Chevy TrailBlazer LT
Imperial Blue Metallic 4.2L I6 4X4
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Exhaust Leak

Hey guys, I have a 2003 Trailblazer with 203k miles. I am looking for some expertise. I have had a slight exhaust leak for about 5,000 miles or so. I took the car on a long trip this weekend and while cruising at 70 mph, all of sudden the exhaust leak got VERY loud. It almost sounds like it is straight pipe. The sound is definitely coming from under the hood. The manifold is still attached to the down pipe. It appears that I did not lose any power.

I haven't taken the heat shield off yet to take a look for myself. I dont want to spend $500 at a shop to have it fixed. I am decent with my hands (not a ton of car experience though). Any advice on this?

I appreciate any input.
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  #26  
Old 01-13-2014, 05:58 PM
TDHeller TDHeller is offline
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Smile Exhaust Leak

Sounds like it may have cracked the Manifold.
The repair isn't too awfully difficult if all goes well.
But at 203K all going well could be a problem.

First before attempting this remove the heat shield and get a better look at the problem.
If it is indeed cracked replacements are available from the Dealer or Ebay (choose a reputable seller).

If replacing the manifold also be prepared to have one or more broken studs, usually in the most inconvenient location. I replaced all of the studs and bolts (about $50.00 at Dealer) If it's out already don't cheap out on the fasteners I'm told there was a design change from the Original bolts.

New gasket (~$15.00) - Easy-outs for broken bolts - drill and tap and Helicoils for the broken ones.
Did mine in about 6hrs in my home garage. Your mileage may vary :-)

Good luck and have a nice weekend
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  #27  
Old 01-14-2014, 12:43 AM
gbernich gbernich is offline
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2003 Trailblazer LT EXT Chevy TrailBlazer LT
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Exhaust leak

Thanks a lot for the advice. I am going to remove the shield this weekend and take a look. With how loud it is it must be a large crack.

Would putting penetrating lubricant on the studs/bolts ahead of time help at all?
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  #28  
Old 01-14-2014, 09:58 AM
TDHeller TDHeller is offline
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P-Oil

It might and it's always a good Idea - but "heat" and SLOW back/forth when walking out will help as well. Remember to expect broken bolts and right at the Head surface
Aluminum heads and steel bolts aren't highly compatible "Electrolysis" isn't your friend.
If you try it - Go slow when bringing them out & good luck.
T.
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  #29  
Old 01-14-2014, 11:48 AM
gbernich gbernich is offline
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2003 Trailblazer LT EXT Chevy TrailBlazer LT
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Exhaust Leak

Ok I will keep that in mind. Thanks a lot. I will post a pic of the manifold after removing this heat shield this weekend.
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